在广告期间，屏幕底部会出现一条信息，提示观众按下按钮以请求获得免费样品或订购优惠券或目录。
During commercials, an overlay will appear at the bottom of the screen, prompting viewers to press a button to request a free sample or order a coupon or a catalogue.
这个特性让身份验证提供者能够向用户或系统请求更多信息。
This feature allows an authentication provider to request additional information from either the user or the system.
安全代理服务器可以根据静态或动态信息路由请求。
A secure proxy server can route requests based on either static or dynamic information.
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